Ureteric Constrictions Flashcards

Identify the traditional sites of ureteric narrowing, their anatomical relationships, variations, and significance in urinary obstruction.

Card 1 of 22Question

What are the three traditional sites of ureteric constriction?

The ureteropelvic junction, iliac vessel crossing, and ureterovesical junction.

In This Section

1. What are the three traditional sites of ureteric constriction?

The ureteropelvic junction, iliac vessel crossing, and ureterovesical junction.

2. Where is the first traditional ureteric constriction located?

At the ureteropelvic junction, where the renal pelvis narrows into the ureter.

3. Where is the second traditional ureteric constriction located?

Near the pelvic brim, where the ureter crosses the iliac vessels.

4. Where is the third traditional ureteric constriction located?

At the ureterovesical junction, where the ureter enters the urinary bladder.

5. What is the ureteropelvic junction?

The anatomical transition between the funnel-shaped renal pelvis and the proximal ureter.

6. Which major muscle lies posterior to the proximal ureter near its first constriction?

The psoas major muscle.

7. Which arteries are commonly crossed by the ureter at the pelvic brim?

The common iliac artery near its bifurcation or the proximal external iliac artery.

8. What anatomical transition occurs near the iliac vessel crossing?

The abdominal ureter enters the pelvis and continues as the pelvic ureter.

9. Is the iliac vessel crossing always a true physiological narrowing of the ureter?

No. It is a traditional constriction site, but consistent intrinsic narrowing at this location is not established.

10. What is the ureterovesical junction?

The junction where the distal ureter enters the urinary bladder.

11. Which part of the distal ureter contributes to its narrowing at the bladder?

The intramural segment that passes obliquely through the bladder wall.

12. What is the functional importance of the oblique intramural ureter?

It helps prevent vesicoureteral reflux by allowing bladder pressure to compress the ureteric passage.

13. Which ureteric narrowing is a particularly common site of urinary stone impaction?

The ureterovesical junction.

14. Why are ureteric constrictions clinically important in nephrolithiasis?

Their relatively narrow passages can impede the movement of urinary calculi.

15. What is ureteropelvic junction obstruction?

Impaired urine drainage from the renal pelvis into the proximal ureter.

16. What congenital abnormality can cause ureteropelvic junction obstruction?

Intrinsic narrowing or abnormal muscular development at the junction.

17. How can an accessory lower-pole renal vessel affect the ureteropelvic junction?

It may cross and compress the junction externally, contributing to urinary obstruction.

18. What is a ureterocele?

A cystic dilation of the terminal ureter within the bladder wall that may obstruct urinary drainage.

19. What change occurs in the ureter proximal to a persistent obstructing stone?

Dilation of the ureter, called hydroureter.

20. What happens to the renal collecting system when a ureteric obstruction causes sustained urinary backpressure?

The renal pelvis and calyces may dilate, producing hydronephrosis.

21. What is the characteristic pain pattern of an obstructing ureteric calculus?

Colicky pain that may radiate from the flank toward the groin.

22. Which imaging technique is commonly used to locate an obstructing ureteric stone in adults?

Noncontrast computed tomography of the abdomen and pelvis.